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CVE-2026-46323

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking th…

Published Jun 9, 2026CWE-416EPSS 0.14%

Overview

CVE-2026-46323 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: gro: don't merge zcopy skbs

skb_gro_receive() can currently copy frags between the source and GRO

skb, without checking the zerocopy status, and in particular the

SKBFL_MANAGED_FRAG_REFS flag.

When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference

on the pages in shinfo->frags. Appending those frags to another skb's

frags without fixing up the page refcount can lead to UAF.

When either the last skb in the GRO chain (the one we would append

frags to) or the source skb is zerocopy, don't merge the skbs.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06Refgit.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8dRefgit.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1Refgit.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80aRefgit.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40Refgit.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71Refaccess.redhat.com/errata/RHSA-2026:27708Refaccess.redhat.com/errata/RHSA-2026:27731Refaccess.redhat.com/errata/RHSA-2026:27735Refaccess.redhat.com/errata/RHSA-2026:36018

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46323?

CVE-2026-46323 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-46323?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-46323?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-46323?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46323 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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